c - 这是编译器错误还是 C 语言功能？

Question

我的环境是 Windows XP SP3 +“Microsoft (R) 32 位 C/C++ 优化编译器版本 14.00.50727.762 for 80x86”。过程如下:

F:\workshop\vc8proj\console> type t.c

int main(void) {

    // Do some thing.
    {
        int i;
        {
            i = 3;
            goto abc111;
        }

        abc111:
    }
    return 0;
}

F:\workshop\vc8proj\console> cl /MD t.c Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86

Copyright (C) Microsoft Corporation. All rights reserved.

t.c t.c(10) : error C2143: syntax error : missing ';' before '}'

F:\workshop\vc8proj\console>vim t.c

F:\workshop\vc8proj\console>type t.c

int main(void) {
    // Do some thing.
    {
        int i;
        {
            i = 3;
            goto abc111;
        }

        abc111: 5201314;
    }
    return 0;
}

F:\workshop\vc8proj\console> cl /MD t.c Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86

Copyright (C) Microsoft Corporation. All rights reserved.

t.c Microsoft (R) Incremental Linker Version 8.00.50727.762 Copyright (C) Microsoft Corporation. All rights reserved.

/out:t.exe t.obj

F:\workshop\vc8proj\console>

Linux操作系统下也是一样的情况？？？

Answer 1

这是一种语言功能。标签只能是标签语句的一部分，并且该语句需要终止;。只需在标签后面放一个分号即可。

int main(void) {

    // Do some thing.
    {
        int i;
        {
            i = 3;
            goto abc111;
        }

        abc111: ;

    }
    return 0;
}

也有效。